Tar-like markings on stems

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JanetR Ottawa, ON(Zone 4a) Sep 11, 2001

Got some sick plants here. So far has infected mainly impatiens, both walleriana and balsamina but I fear it may be spreading to my oleander.

Black marks on the leaves (which subsequently wither and fall off) are followed by tarry marks on the stems. The plant doesn't die outright but becomes an "invalid".

Any clues? Can't find it in my books.

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Calalily Deep South Coastal, TX(Zone 10a) Sep 23, 2001

Sounds like some kind of bacterial blight. Pull out the infected plants and throw them away.
Cala

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JanetR Ottawa, ON(Zone 4a) Sep 25, 2001

The impatiens, both varieties have been pulled. The oleander is in a pot, so I've pruned it back hard and will quarantine it inside and see what happens. Have been spraying with a baking soda solution in case it's a fungal infection.

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Calalily Deep South Coastal, TX(Zone 10a) Sep 25, 2001

JanetR
Try one drop of tea-tree oil in 4 oz of water and spray it with this.
Cala

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Byron Lyndeborough, NH Sep 25, 2001

Ortho Daconil has some effect on late blight aka phytophthora.

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JanetR Ottawa, ON(Zone 4a) Sep 26, 2001

Thanks for the input. Will this disease over-winter in the soil? I was thinking of avoiding impatiens altogether next year to avoid recurrence.

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Calalily Deep South Coastal, TX(Zone 10a) Sep 26, 2001

Janet
I would plant something else in there next year, just in case.
Cala

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ohiorganic New Paris, OH Sep 27, 2001

Do not compost your infected plants and don't landfill them either




BURN THEM


This is the best insurance that you will not spread the disease. Do not plant the same plant (or relatives of it) in the same area for the next few years either to allow the disease to die out. And finally get a postive ID on what ever it is killing your flowers. Take samples to your Master Gardener volunteer or your County Extension Agent. Once you know what it is than you can deal with it.

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JanetR Ottawa, ON(Zone 4a) Sep 28, 2001

Ohio, I'm not American and I don't know what you mean by a County Extension Agent. Extension of what? Department of Agriculture? How would I go about finding a Master Gardener?

I'll keep all varieties of impatiens out of the back yard for a good while and avoid the nursery where I bought the plants that I believe to be the source.

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